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Experimental Studies on Suspension of Solid Particles in a Low‐Shear Stirred Vessel
Author(s) -
Li X.,
Yang C.,
Zhang G.,
Mao Z.S.,
Zhou H.
Publication year - 2011
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201100003
Subject(s) - impeller , shear rate , draft tube , materials science , suspension (topology) , shear (geology) , mechanics , agitator , continuous stirred tank reactor , volumetric flow rate , power consumption , composite material , thermodynamics , power (physics) , rheology , chemical engineering , engineering , mathematics , physics , homotopy , pure mathematics
A low‐shear stirred vessel was explored. Experimental studies on the suspension of solid particles in solid‐liquid and gas‐solid‐liquid systems were conducted to examine the performance of this new reactor. The method based on the power number curve was modified to determine the critical impeller speeds required for just complete off‐bottom suspension of solids under non‐gassed ( N js ) and gassed conditions ( N jsg ) in this reactor, and a PC‐6A fiber‐optic probe for the measurement of solid distribution was used to complementarily validate this method. A more homogeneous flow field was gained with a draft tube installed, so that the standard deviations of average shear rate and maximal shear rate are reduced. The modified power consumption method can determine N js and N jsg , and the values of N js with a draft tube are much lower than those without it. N jsg increases slightly with increasing gas flow rate, and N jsg with a higher solid weight fraction is larger in this lower‐shear reactor.